As Primate of Armagh he held an important synod in 1854, at which all the bishops of the northern province assisted with their theologians. In the same year he began completing the unfinished cathedral of Armagh and almost accomplished the work before his death. In 1856 he formed the diocesan chapter consisting of thirteen members. During his incumbency he brought some religious congregations into the diocese, viz. the
Sisters of Charity of St. Vincent de Paul (1855), who opened a house in
Drogheda; the
Marist Fathers (1851) who opened a college and novitiate in
Dundalk, and the
Vincentian Fathers who were placed in charge of the ecclesiastical seminary the same year. The primate was a defender of the
Holy See and at a public meeting in Drogheda denounced
Napoleon III for complicity in the acts of the Italian revolutionists. His speech and subsequent letter to the ''
Freeman's Journal'' created a sensation and the emperor made them a subject of complaint to
Pope Pius IX. Dixon was the organizer of the Irish Brigade in the papal service. ==Works==